Recording disk data playback apparatus

Claim 1

A recording disk data playback apparatus capable of playback of a first type of recording disk having a signal recorded thereon which has been frequency modulated by a video signal and audio signal respectively, with first data which has been converted to a pulse train by digital modulation being superimposed thereon, and a second type of recording disk having recorded thereon second data which has been subjected to digital modulation processing to be converted to a pulse train, the apparatus comprising: demodulator means for demodulating a playback digital signal; write-in means for writing the demodulated output from said demodulator means into a memory in synchronism with a playback clock signal which is contained in said playback digital signal; clock signal generating means for generating a read-out clock signal, for reading out stored data from said memory; phase synchronization means for synchronizing the output from said clock signal generating means with said playback clock signal; drive means for controlling the speed of rotation of said second recording disk on the basis of an output from said phase synchronization means; means for inhibiting phase synchronization of said clock signal generating means by said phase synchronization means and for fixing the frequency of said read-out clock signal during playback of said second recording disk, and ; means for inhibiting speed control by said drive means during playback of said first recording disk.